/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineGroupsInterface.h
Get the cached list of outstanding invites to a group. If the information is not cached locally, call QueryGroupInvites to request it from the server.
Shared pointer to the cached roster structure if one exists
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< const [IGroupInvites](API\Plugins\OnlineSubsystem\Interfaces\IGroupInvites) > GetCachedGroupInvites ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & ContextUserId, const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & GroupId )